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G. B. MANVILLE.

BOILER GOVERING.

No. 878,372. I Patented Feb. 21, 1888.

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CHARLES B. MANVILLE, OF MILYVAUKEE, XVISCONSIN.

BOILER COVERING.

$PECIPICATION forming part of Letters Patent No. 378,372, dated February21, 1888.

Application filed December 20, 1886. Renewed January 30, 1898. SerialNo.262,470. (No model.)

I 0 all whom, it may c0rwcrn:

Be it known that I, Crmnnns B. .MANVILLE, of Milwaukee, in the county ofMilwaukee and State of XVisconsin, have invented new and use fulImprovements in Boiler-Coverings; and I do hereby declare the followingto be a full, clear, and exact description of said invention, referencebeinghad to the accompanying drawings, and to the letters or figures ofreference marked thercon,which form a part of this specification.

Figure 1 of the drawings represents a crosssection, and Fig. 2 alongitudinal section, of my covering as it is formed preparatory tobeing attached to steam-pipes.

Like parts are represented by the same reference-letters in both views.

My invention relates, first, to the construction of the body of thecovering; second, to the peculiar form of the sections of the covering,by which I am enabled to attach and remove the sections without bendingor breaking the covering, and, third, to the manner of uniting thesections together.

The body A of the covering is formed of alternate layers 01' paper, 13,and a compound consisting of wool shoddy and an adhesive paste or cementintermixed together, forming loose porous layers 0. The body A is formedupon a mandrel or former conforming in size and shape to the pipes orother surface to be covered,when it is removed and dried. When dry, thecylindrical sections for pipes are severed longitudinally by two radialcuts, D D, thus forming a wedge-shaped piece, E, which, as it is pressedinward toward the pipe or central opening, is brought in close contactwith the part G. The converging ends of the cuts D D terminate at theinner surface of the cylinder at such a distance apart as will permitthe pipe to enter the aperture F without bending the part G.

In forming the covering the paper B is drawn through a paste which ismade of clay and such other adhesive substances as are ordinarily usedfor like purposes. From the pasteeontaining receptacle the paper isdrawn upon or wound around a mandrel or former, and as the paper isbeing thus drawn from the pastereceptacle, with its surfaces coveredwith the adhesive substance, a quantity of loose wool shoddy is evenlydistributed over its surface of such a depth as will form a layer of thede sired thickness. The wool thus distributed adheres to the paste, andis wound in layers around the mandrel between the paper, thus formingthe layer 0 referred to. If desired, the shoddy may be mixed with thepaste and the two thoroughly ground together before applying the same tothe paper, the result produced being the same by both methods. Ipreferably mix with the adhesive paste and shoddy a non-combustiblesolution,which penetrates the shoddy and paper and prevents them frombecoming ignited. lhe layer G thus interposed serves a threefoldfunction: first, by its use the desired thickness of covering isproduced with a much less quantity of paper than would otherwise berequired; second, a non-combustible wall is thereby formed between eachlayer of paper, which being a poor conductor of heat, it serves toshield the paper and lessens the liability of its becoming injured byhigh temperature, to which it is subjected, and, third, it serves tocement the layers together, thereby forming a substantial structure,which may be mauuiactured in va rious sizes and shapes and put up by thetrade without danger of injury and without requiring the skilled laborof the manufacturer. \Vhen the sections have been thus formed, dried,and severed, as shown, a thin layer of cl ay,,H, is applied to theirinner surface, and an instrument is then applied to the layer of clay,by which itis grooved or furrowed, thus forming a series of ribs orelevations, I, and a series of furrows, J. The ribs I serve as bearingsor contact-points, which bear against the pipes, and thus support thecovering at a slight distance therefrom, while the furrows J serve asair-spaces.

W'hen attaching the covering, all the joints and contiguous surface ofthe covering are covered with the adhesive substance and shoddyintermixed, as shown at a a and I). To insure greater strength, ametallic band, K, is drawn firmly around the sections, preferably at thejoints, as shown in Fig. 2, whereby the covering is held firmly in placeand the sections prevented from being disengaged.

I am aware that felt has previously been used in layers between layersof paper in boilercovering, and I make no claim to such use as myinvention, nor to the use of the dry wool shoddy alone with paper; butinstead I use a novel compound consisting of paste and wool shoddyground or intermixed together, as described, and interposed when thusmixed be fore drying between the layers of paper, which compound thusapplied when dry adheres to the paper and adds great strength to thecovering.

Having thus described my invention, what I claim as new, and desire tosecure by Letters Patent, is-

1. The boiler-covering herein described,composed of alternate layers ofpaper and a compound composed ofan adhesive paste and wool shoddyintermixed and applied beforedrying between said paper and adapted whendry to adhere to said paper, substantially as set forth.

2. In covering for steanrpipes, the combination of the cylindricalsection G, adapted to nearly surround the pipe, and the wedgeshapedsection E, respectively composed of paper and a compound consisting ofpaste and wool shoddy ground or intermixed together and applied betweenand adapted to adhere to the layers of paper forming said sections,substantially as set forth.

3. In steam pipe and boiler covering, the combination of the alternatelayers of paper and layers composed of adhesive paste and Wool shoddy,with the inner bearing clay surface, H, formed in ridges and grooves,substantially as and for the purpose specified.

4. In steam-pipe covering, the combination of the circular section G,wedge-shaped section E, adhesive paste a a, interposed between thecontiguous ends of said sections, grooved claybearing surfaces H, andmetallic band K, all substantially as and for the purposespecified.

In testimony whereof I aflix my signature in

